[R] R-help Digest, Vol 39, Issue 13

[Alan Cobo-Lewis]

r-help at stat.math.ethz.ch on Saturday, May 13, 2006 at 6:00 AM -0500 wrote:
>> lme(biomass~age, random=~woods/age)?

Jörn

Consult Pinheiro and Bates (2000, Mixed-effects models in S and S-Plus, Springer, ISBN 0-387-98957-0 ref 7 at http://www.r-project.org/doc/bib/R-books.html ) for how to fit more elaborate models, but two straightforward ones that might be adequate
are
lme( biomass~age, random=~1|woods )
and
lme( biomass~age, random=~age|woods )

In the lme4 library corresponding syntax is
lmer( biomass~age+(1|woods) )
and
lmer( biomass~age+(age|woods) )

For vignettes on the lme4 library see the mlmRev library and
@ARTICLE{Rnews:Bates:2005,
  AUTHOR = {Douglas Bates},
  TITLE = {Fitting Linear Mixed Models in {R}},
  JOURNAL = {R News},
  YEAR = 2005,
  VOLUME = 5,
  NUMBER = 1,
  PAGES = {27--30},
  MONTH = {May},
  URL = {[ http://CRAN.R-project.org/doc/Rnews/ ]http://CRAN.R-project.org/doc/Rnews/}
}

alan

--
Alan B. Cobo-Lewis, Ph.D.		(207) 581-3840 tel
Department of Psychology		(207) 581-6128 fax
University of Maine
Orono, ME 04469-5742     		alanc at maine.edu

http://www.umaine.edu/visualperception